Temperature and deformation effect on the low and high angle grain boundary structure of a double forged pure tungsten

Hua Sheng, Zhi Sun, Inge Uytdenhouwen, Guido Van Oost, Jozef Vleugels, Milan Konstantinovic

    Research outputpeer-review


    In order to improve the performance of tungsten, a basic understanding of the microstructure–property relationships is essential. In the present study, a newly developed double forged pure tungsten grade fromPlansee SE was investigated. By analysing the mechanical properties and microstructures in well-defined directions in the double forged tungsten, their relationships could be successfully correlated. A large amount of sub-grainswith a typical size below 5 μm were observed in the as-received double-forged tungsten. After thermally treating the double forged tungsten up to 2000 °C, microstructural recoverywas observed with the onset of recrystallization. Meanwhile, the sub-grain misorientation angle increased accompanied by sub-grain growth. The deformation temperature and the strain rate considerably influenced the final microstructure. The higher the temperature, the lower the amount of sub-grain boundaries due to sub-grain coarsening and the clearer the grain boundaries. The higher the deformation strain rate during tensile testing, the higher the grain orientation spread and the larger the sub-grain misorientation, but the smaller the grain size due to a lower extent of crystallization. This matched well with the mechanical testing data.
    Original languageEnglish
    Pages (from-to)184-190
    JournalInternational Journal of Refractory Metals & Hard Materials
    Issue number5
    StatePublished - 21 Jan 2015

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